<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>登录成功</title>
    <style>
        html,body{height: 100%}
        #loginbtn{font-weight: bold;color:#fff;}
    </style>
</head>
<body>
    <div style="text-align: center;display: flex;justify-content: center;align-items: center;height: 90%;width: 100%">
        <span id="loginbtn">登录成功!!!</span>
    </div>
</body>
</html>